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- Add new enum GimpComponentType which contains u8, u16, u32 etc.
- Change GimpPrecision to be u8-linear, u8-gamma, u16-linear etc.
- Add all the needed formats to gimp-babl.c
- Bump the XCF version to 5 and make sure version 4 with the old
  GimpPrecision enum values is loaded correctly

This change blows up the precision enums in "New Image" and
Image->Precision so we can test all this stuff. It is undecided what
format will be user-visible options in 2.10.

Need to check image->active[ALPHA_G,I] for the alpha component.

which removes more FS knowledge from the image.

which gets rid of the gegl:over we used to combine them.

and make it the parent class of GimpItemStack. Which means we now have
a generic stack of filters independent of any image items.

It's supported since GLib 2.28.

so it's not always 8 bit and can be used to copy real data from in all
precisions.

Fix this and other issues more globally by moving the logic that
formats the image's display name into the GimpImage object, and return
the properly formatted name, e.g. "Foo.xcf", or "[Foo] (imported)"
from gimp_image_get_display_name().

Also add gimp_image_get_display_path() which returns the full path
instead. Use the two functions for formatting the image title, and
apply various other fixes that make sure the UI always uses the same
string to identify the image.

Call gimp_object_name_changed() whenever the save/export status
changes, so the image's cached display name and path get cleared.

because GimpViewable already implements exactly the same.

In fact, it broke much more than that because the way XCF loading
replaced the image's mask prevented the image's "mask-changed" signal
from ever being emitted. Add private API gimp_image_take_mask() which
properly sets the mask and use it for image construction and the XCF
selection loading hack.

and use it instead of gimp_babl_format() in some places where indexed
formats can occur. Also fix some places using gimp_babl_format() to
special case indexed formats correctly.

and update tons of includes in libgimp and app.

to be "Y u8", so it at least extracts something reasonable.

and use babl_format_get_palette() to simplify some code.

Add GimpOperationMaskComponents, enum GimpComponentMask, and image and
drawable infrastructure to get the right mask, and plug the mask
operation into gimp_gegl_create_apply_buffer_node().

Images in that format can't be created currently, the legacy code
crashes royally on it.

Add gimp_image_get_precision(), and a "precision" argument to
gimp_babl_format(). Change code accordingly and do some more format
related cleanups.

which kills almost all remaining use of GimpImageType.

and forget about include policy in base/, it's scheduled for removal
anyway.

and remove the "take_ownership" parameter from
gimp_temp_buf_create_buffer(), simply always ref the buf.

which for now return the same thing (Y' u8) and need to be used
in more places before becoming useful.